MorphTo Relation

[ryandialpad]

Type of PR:

• Bugfix
• Feature
• Refactor
• Code style update
• Build-related changes
• Test
• Documentation
• Other, please describe:

Breaking changes:

• No
• Yes

Details

Implements MorphTo relation, building off of the refactor by @kiaking. I have addressed the two discussed fixes that we wanted to add.

1. Remove results argument from match method in each relation and use the query to eager load the results instead.
2. Copy parent query constraints to the new related queries -> need to test this locally and further investigate

I have also addressed an issue from the refactor where multiple results from the same related model would be missing their related data as a result of the query constraints carrying forward in the shared queries.

TODO:

1. Gather early feedback & make adjustments
2. Cleanup tests
3. Further test query constraints to ensure that they are working correctly with this relation

[codecov]

Codecov Report

Merging #107 (55b8bdc) into master (8d5245a) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #107   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           38        40    +2     
  Lines         1153      1252   +99     
  Branches       185       196   +11     
=========================================
+ Hits          1153      1252   +99     

Impacted Files	Coverage Δ
src/model/attributes/relations/Relation.ts	100.00% <ø> (ø)
src/database/Database.ts	100.00% <100.00%> (ø)
src/model/Model.ts	100.00% <100.00%> (ø)
src/model/attributes/relations/BelongsTo.ts	100.00% <100.00%> (ø)
src/model/attributes/relations/HasMany.ts	100.00% <100.00%> (ø)
src/model/attributes/relations/HasManyBy.ts	100.00% <100.00%> (ø)
src/model/attributes/relations/HasOne.ts	100.00% <100.00%> (ø)
src/model/attributes/relations/MorphOne.ts	100.00% <100.00%> (ø)
src/model/attributes/relations/MorphTo.ts	100.00% <100.00%> (ø)
...c/model/decorators/attributes/relations/MorphTo.ts	100.00% <100.00%> (ø)
... and 3 more

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[cuebit]

Looks good so far, left a few comments for your consideration 👍

[ryandialpad]

Already merged into #106